THE INFLUENCE OF AGE ON LITTER-SIZE

in Journal of Endocrinology
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SUMMARY

In three related strains of rats the numbers of fertile females have been found to fall with age and with the birth of successive litters. In thirty-five rats belonging to these three strains, each of which had a minimum of eight litters, the second litter was generally bigger than the first. From then on, however, litter-size gradually fell until the animals ceased to breed.

 

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